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cluster point

noun Mathematics.
  1. a point of a net having the property that the net is frequently in each neighborhood of the point.
  2. accumulation point.
  3. a point of a filter having the property that every neighborhood of the point has points in common with every set in the filter.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018